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Less than standard separation when controller descended cpr-small transport through the altitude of air carrier-medium large transport and lateral separation was not maintained.
| Attributes | |
| ACN | 84267 |
| Time | |
| Date | 198803 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : loz |
| State Reference | KY |
| Altitude | msl bound lower : 31200 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : non radar |
| ASRS Report | 84267 |
| Person 2 | |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Small transport X, an inbound to standiford, was at FL350. Medium large transport Y, en route from nashville to phl, was at FL330. The rebel hi radar controller descended small transport X to FL310. Small transport X was later told to expedite his descent to FL310 and report reaching. At that time small transport X reported leaving FL320. When C/a activated, small transport X was asked his altitude and he reported level at FL310. 5 mi radar sep was lost before small transport X reported reaching FL310.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION WHEN CTLR DESCENDED CPR-SMT THROUGH THE ALT OF ACR-MLG AND LATERAL SEPARATION WAS NOT MAINTAINED.
Narrative: SMT X, AN INBND TO STANDIFORD, WAS AT FL350. MLG Y, ENRTE FROM NASHVILLE TO PHL, WAS AT FL330. THE REBEL HI RADAR CTLR DSNDED SMT X TO FL310. SMT X WAS LATER TOLD TO EXPEDITE HIS DSCNT TO FL310 AND RPT REACHING. AT THAT TIME SMT X RPTED LEAVING FL320. WHEN C/A ACTIVATED, SMT X WAS ASKED HIS ALT AND HE RPTED LEVEL AT FL310. 5 MI RADAR SEP WAS LOST BEFORE SMT X RPTED REACHING FL310.
Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.